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This is not a bug, those links in the horizontal menu are an on-page menu that is generated by the modular sections. It really makes no sense to have those view in the 'mobile' menu because you are already on that page, just scroll!

However, if you did for some reason want them, you would have to make some edits.

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thanks for your answer and sorry for late reply. I see the usage when it comes to usability an seo.

seo:
For mobile search crawlers, a menu is always a verry good idea to help the crawlers divide the sections on the website, especially on onepagers. Also in search engine resultpages, for example:
if someone is searching for "mywebsite contact" in google.com, if there is a menu, google will list http://www.example.com#contact in the results. Thats verry importand for relevance and ranking!

Also for usability. Why should a user get a navigation on the desktop version and when he returns on a mobile device there is none? Thats confusing.

regards, Christian

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That's the implementation of the menu in the Antimatter theme and other themes that follow the same way of doing things. I don't think modular pages sections should go in the menu by default, but everyone has its own needs and you can tweak Grav to do what you want.